/*
 * Copyright 2004-2014 SmartBear Software
 *
 * Licensed under the EUPL, Version 1.1 or - as soon as they will be approved by the European Commission - subsequent
 * versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 *
 * http://ec.europa.eu/idabc/eupl
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the Licence is
 * distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the Licence for the specific language governing permissions and limitations
 * under the Licence.
*/

package org.syntax.jedit.tokenmarker;

import javax.swing.text.Segment;

import org.syntax.jedit.KeywordMap;
import org.syntax.jedit.SyntaxUtilities;

/**
 * PHP token marker.
 *
 * @author Clancy Malcolm
 * @version $Id: PHPTokenMarker.java,v 1.1 1999/12/14 04:20:35 sp Exp $
 */
public class PHPTokenMarker extends TokenMarker {
    public static final byte SCRIPT = Token.INTERNAL_FIRST;

    public byte markTokensImpl(byte token, Segment line, int lineIndex) {
        char[] array = line.array;
        int offset = line.offset;
        lastOffset = offset;
        lastKeyword = offset;
        int length = line.count + offset;
        boolean backslash = false;

        loop:
        for (int i = offset; i < length; i++) {
            int i1 = (i + 1);

            char c = array[i];
            if (c == '\\') {
                backslash = !backslash;
                continue;
            }

            switch (token) {
                case Token.NULL: // HTML text
                    backslash = false;
                    switch (c) {
                        case '<':
                            addToken(i - lastOffset, token);
                            lastOffset = lastKeyword = i;
                            if (SyntaxUtilities.regionMatches(false, line, i1, "!--")) {
                                i += 3;
                                token = Token.COMMENT1;
                            } else if (SyntaxUtilities.regionMatches(true, line, i1, "?php")) {
                                addToken(5, Token.LABEL);
                                lastOffset = lastKeyword = (i += 4) + 1;
                                token = SCRIPT;
                            } else if (SyntaxUtilities.regionMatches(true, line, i1, "?")) {
                                addToken(2, Token.LABEL);
                                lastOffset = lastKeyword = (i += 1) + 1;
                                token = SCRIPT;
                            } else if (SyntaxUtilities.regionMatches(true, line, i1, "script>")) {
                                addToken(8, Token.LABEL);
                                lastOffset = lastKeyword = (i += 7) + 1;
                                token = SCRIPT;
                            } else {
                                token = Token.KEYWORD1;
                            }
                            break;
                        case '&':
                            addToken(i - lastOffset, token);
                            lastOffset = lastKeyword = i;
                            token = Token.KEYWORD2;
                            break;
                    }
                    break;
                case Token.KEYWORD1: // Inside a tag
                    backslash = false;
                    if (c == '>') {
                        addToken(i1 - lastOffset, token);
                        lastOffset = lastKeyword = i1;
                        token = Token.NULL;
                    }
                    break;
                case Token.KEYWORD2: // Inside an entity
                    backslash = false;
                    if (c == ';') {
                        addToken(i1 - lastOffset, token);
                        lastOffset = lastKeyword = i1;
                        token = Token.NULL;
                        break;
                    }
                    break;
                case Token.COMMENT1: // Inside a comment
                    backslash = false;
                    if (SyntaxUtilities.regionMatches(false, line, i, "-->")) {
                        addToken(i + 3 - lastOffset, token);
                        i += 2;
                        lastOffset = lastKeyword = i + 1;
                        token = Token.NULL;
                    }
                    break;
                case SCRIPT: // Inside a JavaScript or PHP
                    switch (c) {
                        case '<':
                            backslash = false;
                            doKeyword(line, i, c);
                            if (SyntaxUtilities.regionMatches(true, line, i1, "/script>")) {
                                // Ending the script
                                addToken(i - lastOffset, Token.KEYWORD3);
                                addToken(9, Token.LABEL);
                                lastOffset = lastKeyword = (i += 8) + 1;
                                token = Token.NULL;
                            } else {
                                // < operator
                                addToken(i - lastOffset, Token.KEYWORD3);
                                addToken(1, Token.OPERATOR);
                                lastOffset = lastKeyword = i1;
                            }
                            break;
                        case '?':
                            backslash = false;
                            doKeyword(line, i, c);
                            if (array[i1] == '>') {
                                // Ending the script
                                addToken(i - lastOffset, Token.KEYWORD3);
                                addToken(2, Token.LABEL);
                                lastOffset = lastKeyword = (i += 1) + 1;
                                token = Token.NULL;
                            } else {
                                // ? operator
                                addToken(i - lastOffset, Token.KEYWORD3);
                                addToken(1, Token.OPERATOR);
                                lastOffset = lastKeyword = i1;
                            }
                            break;
                        case '"':
                            if (backslash) {
                                backslash = false;
                            } else {
                                doKeyword(line, i, c);
                                addToken(i - lastOffset, Token.KEYWORD3);
                                lastOffset = lastKeyword = i;
                                token = Token.LITERAL1;
                            }
                            break;
                        case '\'':
                            if (backslash) {
                                backslash = false;
                            } else {
                                doKeyword(line, i, c);
                                addToken(i - lastOffset, Token.KEYWORD3);
                                lastOffset = lastKeyword = i;
                                token = Token.LITERAL2;
                            }
                            break;
                        case '#':
                            doKeyword(line, i, c);
                            addToken(i - lastOffset, Token.KEYWORD3);
                            addToken(length - i, Token.COMMENT2);
                            lastOffset = lastKeyword = length;
                            break loop;
                        case '/':
                            backslash = false;
                            doKeyword(line, i, c);
                            if (length - i > 1) /* This is the same as if(length > i + 1) */ {
                                addToken(i - lastOffset, Token.KEYWORD3);
                                lastOffset = lastKeyword = i;
                                if (array[i1] == '/') {
                                    addToken(length - i, Token.COMMENT2);
                                    lastOffset = lastKeyword = length;
                                    break loop;
                                } else if (array[i1] == '*') {
                                    token = Token.COMMENT2;
                                } else {
                                    // / operator
                                    addToken(i - lastOffset, Token.KEYWORD3);
                                    addToken(1, Token.OPERATOR);
                                    lastOffset = lastKeyword = i1;
                                }
                            } else {
                                // / operator
                                addToken(i - lastOffset, Token.KEYWORD3);
                                addToken(1, Token.OPERATOR);
                                lastOffset = lastKeyword = i1;
                            }
                            break;
                        default:
                            backslash = false;
                            if (!Character.isLetterOrDigit(c) && c != '_' && c != '$') {
                                doKeyword(line, i, c);
                                if (c != ' ') {
                                    // assume non alphanumeric characters are operators
                                    addToken(i - lastOffset, Token.KEYWORD3);
                                    addToken(1, Token.OPERATOR);
                                    lastOffset = lastKeyword = i1;
                                }
                            }
                            break;
                    }
                    break;
                case Token.LITERAL1: // Script "..."
                    if (backslash) {
                        backslash = false;
                    } else if (c == '"') {
                        addToken(i1 - lastOffset, Token.LITERAL1);
                        lastOffset = lastKeyword = i1;
                        token = SCRIPT;
                    }
                    break;
                case Token.LITERAL2: // Script '...'
                    if (backslash) {
                        backslash = false;
                    } else if (c == '\'') {
                        addToken(i1 - lastOffset, Token.LITERAL1);
                        lastOffset = lastKeyword = i1;
                        token = SCRIPT;
                    }
                    break;
                case Token.COMMENT2: // Inside a Script comment
                    backslash = false;
                    if (c == '*' && length - i > 1 && array[i1] == '/') {
                        addToken(i + 2 - lastOffset, Token.COMMENT2);
                        i += 1;
                        lastOffset = lastKeyword = i + 1;
                        token = SCRIPT;
                    }
                    break;
                default:
                    throw new InternalError("Invalid state: " + token);
            }
        }

        switch (token) {
            case Token.LITERAL1:
                addToken(length - lastOffset, Token.LITERAL1);
                break;
            case Token.LITERAL2:
                addToken(length - lastOffset, Token.LITERAL2);
                break;
            case Token.KEYWORD2:
                addToken(length - lastOffset, Token.INVALID);
                token = Token.NULL;
                break;
            case SCRIPT:
                doKeyword(line, length, '\0');
                addToken(length - lastOffset, Token.KEYWORD3);
                break;
            default:
                addToken(length - lastOffset, token);
                break;
        }

        return token;
    }

    // private members
    private static KeywordMap keywords;
    private int lastOffset;
    private int lastKeyword;

    static {
        keywords = new KeywordMap(false);
        keywords.add("function", Token.KEYWORD2);
        keywords.add("class", Token.KEYWORD2);
        keywords.add("var", Token.KEYWORD2);
        keywords.add("require", Token.KEYWORD2);
        keywords.add("include", Token.KEYWORD2);
        keywords.add("else", Token.KEYWORD1);
        keywords.add("elseif", Token.KEYWORD1);
        keywords.add("do", Token.KEYWORD1);
        keywords.add("for", Token.KEYWORD1);
        keywords.add("if", Token.KEYWORD1);
        keywords.add("endif", Token.KEYWORD1);
        keywords.add("in", Token.KEYWORD1);
        keywords.add("new", Token.KEYWORD1);
        keywords.add("return", Token.KEYWORD1);
        keywords.add("while", Token.KEYWORD1);
        keywords.add("endwhile", Token.KEYWORD1);
        keywords.add("with", Token.KEYWORD1);
        keywords.add("break", Token.KEYWORD1);
        keywords.add("switch", Token.KEYWORD1);
        keywords.add("case", Token.KEYWORD1);
        keywords.add("continue", Token.KEYWORD1);
        keywords.add("default", Token.KEYWORD1);
        keywords.add("echo", Token.KEYWORD1);
        keywords.add("false", Token.KEYWORD1);
        keywords.add("this", Token.KEYWORD1);
        keywords.add("true", Token.KEYWORD1);
        keywords.add("array", Token.KEYWORD1);
        keywords.add("extends", Token.KEYWORD1);
    }

    private boolean doKeyword(Segment line, int i, char c) {
        int i1 = i + 1;

        int len = i - lastKeyword;
        byte id = keywords.lookup(line, lastKeyword, len);
        if (id != Token.NULL) {
            if (lastKeyword != lastOffset) {
                addToken(lastKeyword - lastOffset, Token.KEYWORD3);
            }
            addToken(len, id);
            lastOffset = i;
        }
        lastKeyword = i1;
        return false;
    }
}
